Thermostat damper-regulator.



' R. E. DEWEY. THERMOSTAT DAMPBBNBBGULATOR.

APPLIATION FILED NOV. 27, 1909.

Patented 11611121911.

FUEL EDE 'nm-1 .RUEIL E. DEWEY, 0F GRAND RAPIDS, MICHIGAN.

THERMOSTAT DAMPER-REGULATOR.

Specicatioh of Letters Patent. Patented Dec. 12, 1911.

Application me@ November 27, 1909. serial Ne. 530,132.

To all whom 'it may concern:

Be it known that I, RUEL E. DEWEY, a citizen of the United States of America, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Thermostat Damper-Regulators; and I do hereby declare the following to be a full, clear, and `exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates, to improvements in.

thermostat damper regulators, and more particularly to improvements in the device shown in my Patent No. 926,391, dated June 29, 1909, on thermostat damper regulator,

and its object is to simplify the construction and improve the operation of the dev1ce,`

In' the patent referred to, I show all of i the conductors of the room thermostat, connected through the auxiliary thermostat, andthe Alatter operating a switch in each opening and closing circuit of the room thermostat. When the auxiliary thermostat operates to both open and close the damper it requires twoswitch member'sin the auxlliary thermostat; I find however that this is unnecessary and complicated, and that by arranging the conductors and switches as herein described, but one switch member in thev auxiliarythermostat is sufficient, much simpler and better, thus limiting the auxil.

iary thermostat to closing the damper only, it being preferable to keep the damper closed aslong as the room is warm enough. In my present device I connect the single switch member of each thermostat in series and directly with the battery, connecting the room thermostat at one side directly to the motor to open the damper at the other side through the auxiliary thermostat to operate the motor to close the damper, both thermostats are thus adapted to close the damper and one only adapted to open the same; the auxiliary thermostat thus cuts out the room thermostat and short circuits the closing circuit to close the damper whenever the temperature of the heating medium rises and restores the circuit of the room thermostat when said temperature falls but does not open the damper.

Referring to the accompanying drawings, Figure 1 is a diagrammatic representation of a portion of a building showing the ap- Fig. 3 a rear elevation of the upper part of the-same; and, Fig. 4 a front elevation of the device shown lin Fig. 2 with portions broken away.

Like numbers refer to like parts in all of the figures.

19 represents a room to be heated; 20 a thermostat in the said room; 21 a boiler having a damper 23 opened and closed by a chainv 24 operated by an electric motor 22. The thermostat 20 1s ofany of the usual forms, adapted to close one electric circuit when the, temperature in the room is high and to close another electric circuit when said temperature is low. The electric motor 22 is also of any usual construction and adapted to close the damper when operated by the first named circuit and adapted to open the damper when operated byI the other circuit. The high side of the ther- Inostat 2O is connected to the closing side of the same connected to the opening means of the motor by a conductor 28; the switch K member of the thermostat 20 is connected to thebattery by a conductor 25, and thelnotor boiler itself,`or closely connected therewith in such manner that the uid "contained therein will be substantially ofv the same temperature as the iuid in the boiler.

3 is a tube inserted in this chamber and externally exposed to the-fluid therein and heated thereby,-being closed at its lower end by a 4plug 4 having a lug 4** on its yinner end to which latter is attached a shifting thermostat member 5, which extends upward through the tube 3 and into the case 1, and is laterally movable therein in the usual way by virtue of the unequal expansion of the two strips of metal of which it is composed, moving to the right as the temperature 1ncreases, and to the left as the temperature decreases. An arm 6 having an upturned end to support the adjusting screw 7 and tubular guide 8, is attached to the movable end of the member 5.

9 is a push rod, one end of which is slidable within the tubular guide 8 and engages the'end of an adjusting screw 7, this screw being provided with a lock nut 10 tor hold it inany adjusted position. The screw can thus move away from the push rod when the device cools down.` The opposite end of the push rod 9 is pivoted to the short arm of a bell crank 11, the other arm of which is upturned to engage a movable electrode or switch member 12 xed at one end in a binding post 13 and movable at its other end to alternately engage contact screws in the posts 17 and 18. The bell crank 11` is eccentrically pivoted to a rotative support 14, which extends through the back of the case and is provided with a .lever 15 by which it is manually adjusted about its axis. Said support 14 is also provided with an index 16 which traverses a scale conveniently located to indicate the desired temperature to which the heating fluid in the boiler is to be regulated. By turning the support 111` about its axis, thek bell crank lever is adjusted toward or away from the screw 7, thus changing the temperature at which the electrode 12 will be lifted by the bell crank lever and the electric circuits shifted, as hereafter described. The electrode 12 normally engages an adjustable screw contact in the binding post 17, and when raised by the bell crank 11, engages a similar adjustable screw contact in the binding post 18. 'Ihe binding posts 13, 17 and 18 extend through the back of the case 1 and are, insulated therefrom, the post 18 being joined to the conductor 27 and the f postsv13 and 17 forming terminals at each side of a gap in the conductor 25 said gap being normally closed by the movable electrode or switch member 12.` The posts 13 and 17 and the electrode 12 thus are normally in circuit with the conductor 25 and close the connection of the switch member of the thermostat 2O with-the battery.

In operation, when the heating fluid is at or below the required temperature, the Ielectrode 12 will normally engage the screw in the binding post 17 and the thermostat 20 will operate to open and close the damper fin the usualway. Should the temperature of the heatin fluid rise above the maximum temperature or which the device is adjusted as indicated by the index 16, the thermostat member 5 will move to the right and moving the bell crank 11,A will thus raise' the end of the electrode 12 away from the contact' inthe binding post 17 and in engage-g ment with the contact in the post-18 'thus breaking the Acircuit of the thermostat 20,`

closing the closing circuit of the motor, and operating the motor to close the damper, which will remain closed until the temperature of the heating fluid falls enough to allow the thermostat member 5 to move to the left and lower the electrode 12 into engagement with the contact in the post 17, whereupon the room thermostat will resume operation as before. I find that this fall of temperature in the heating fluid and-restoration of the room thermostat to operation will occur before it becomes necessary to open the damper again; I am thus able to dispense with any damper opening function of the auxiliary thermostat and materially simplify its construction.

What I claim is 1. In combination with a heat generator having a damper, a motor for controlling said damper and a thermostat having electrical connections for controlling said motor; a device comprising a conductor joined to a motor connection of said thermostat, a switch adapted to contact with said conductor inserted in the battery connection of said thermostat and a thermal element directly subject to the heat of said generator adapted to control said switch.

2. In combination with a heat generator having a damper, an electric motor for opening and closing said damper, a thermostat connected to a battery and having two electricalconnections to the motor to respectively control the motor to open and close the damper, a lateral conductor in the closnection of the thermostat and a thermal elelment adapted to shift said switch subjected directly to the heat of said generator.

3. In combination with a heat generator having a damper, an electric'motor to open and close thedamperya thermostat having its thermal element connected to a battery and its terminals respectively connected to the opening and closing mechanism of the motor, and an auxiliary thermostat having its thermal element subjected directly to the heat of said generator, a switch in the circuit of the battery connection shifted by movement of said element to shift the battery connection from the first` named thermostat to the closing connection of the same. c

4. In combination with a heat generator having a damper, means for opening and closingthe said damper, a thermostat connected to a battery and having one electric connection to the closing means and another connection to the "opening means to respectively control the same, a switch in the battery connection' of the thermostat adapted lto shift the battery connection from the thermostat to the closing means, and a thermal element adapted to operate the switch subjected directly to the heat of said generator.

5. In combination with a heat generator having a damper, means for opening said damper, means for closing said damper, a thermostat having its movable terminal connected to a battery,l conductors from said thermostat to respectively control the opening and closingmeans', a switch in the battery connection normally closing the same 'and adapted to shift the same to the connection for controlling the .closing means, a thermal element moved by change of temperature and directly subjected to the heat of said generator, a tube carried by said element, a pin slidable in the tube, an adjustable screwin the tube engaging the pin and a lever operated by the pin to shift the switch.

6. In combination lwith a heat generator having a damper,` means for closing the, damper, means for opening the damper, a

thermostat, a connectlon from the thermostat to control the closing means, a second connection( from, the thermostat to control the opening means, a switch in the battery connection and normally closingthe same, a thermal element. subjected directly to the heat of said generator and adapted to move the switch and shift the battery circuit from the thermostat to the closing means when the temperature rises and to restore the battery connection to the thermostat when the said temperature falls.

In testimony whereof I aiix my signature in presence of two witnesses.

, g RUEL E. DEWEY. Witnesses z4 GEORGIANA Omen, LUTHER V. MoULfroN. 

